Isotopes are atoms of the same element with different numbers of neutrons. Some elements have more than one isotope and some don't. The isotopes of an element are chemically identical, they just differ in mass. There is nothing special about any particular isotope, elements with them are just as 'regular' as the few which don't.
Atomic Mass
isotops
Atoms of same element with same atomic number,which have different mass number is called isotops.
Just about anywhere.
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Because certain groups have different characteristics, so when you move to a different group the characteristics will be different.
Isotopes have same number of electrons, same atomic no. but different mass no. They are from the same element like isotopes of carbon. They are not having same number of neutrons. They show same electronic configuration.
Oxygen has 3 stable isotops found in the nature 16O (99,757%), 17O (0,038%), 18O (0,205%). There are also 14 other isotops made by humans, but the most stable one is 15O with a half-life of 122 seconds.
Compounds are made when atoms of 2 different elements are combined in regular forms.Repeating patterns of either atoms (one element) or molecules (2 or more elements), or perhaps ionic bonded atoms (2 or more elements, ionic bonds) are found in solids.The most regular patterns are found in crystals which is a type of solid.
Regular elements contain regular neutron number and the same number of protons and neutrons. Isotopes have different neutron numbers than the original element, but the same number of protons and electrons.
No, that is why we have isotops. Example: hydrogen can have 0,1,2 neutrons
Different people found different elements.